Hey there,
Viktor was the first champ I started playing lol with ( I skipped Ashe in tutorial ) and I main him.
Viktor is a unique mid laner so u can't just compare it with Ahri or lux.
He comes weak early game but as the game goes on u will get more and more powerful so far that u might end up killing an adc with Q+E+ basic attack in less than a second . This actually confuses both Viktor players and their opponents cause his power could be a mystery through out the game Since your power grows rapidly.
Laning:You'd better not start a fight early and keep safe farming + poke with your E or Q +BA when enemy mid laner wants to farm.Use your W defensive early. DO NOT WASTE YOUR MANA. You can easily farm with your E after 6 and your augment (if u don't fall behind). After 6 you have a high chance of killing the enemy if you zone them in your W and ult them.
Teamfights: After the recent mage updates they changed his ult to be strong in team fights. in team fights u just must zone your enemies in the gravity field + ult and E them their HP will be melting for the next 6 seconds( right now
is essential since they will be slowed to death)
If you think you like this type of champion then go on and buy him train with him and it will pay off in right hands he is quite strong, some are just
(blind) to see ...